dually cross and tranny members work on 75 SWB?

[full foot notch]

ok, at my buddies repo shop, he got in what looks to be a 1980 crew cab dually that is basically a rustbucket (sat next to a marina for 3 years with no movement or care)

and i was looking at it and since hte guy we towed it away from already took the engine and tranny, and most everything in the engine compartment, hell the dude even cut half of the front radiator mount out in the front for easy access and removal

so ive looked at the message boards and basically read every post made, so it would better inform me, but really coundlt figure out any of this info that im gonna ask

on the dually, there is the tranny crossmember tucked back that i am not sure if its the double hump Xmember that everyone seeks, but the only way i can really describe it is that its high on the sides, but in the center, it goes straight across so its one of those its sorta looks like --______-- , thats the best i can describe it

and as for the front cross member, i was wanting to know if just the crossmember itself can be used on the truck, minus all of the A arm stuff and steering, cause basically my plan was to, if it would work, that i could remove this front crossmember, and section it and install it on the truck that i am working on, when i put in the crate motor, becuase i really do not have the time and space to have my project on jackstands, while i section the crossmember, IE it would benefit me more if i had this already done for the engine swap , so half of me says the front crossmember would work, cause it seems the space on the framerails is almost the same, but the other half of me says it will not work, becuase it was intended for a dually and a heavier load bearing condition